Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058905
C. Roblin
The Wireless Body Area Networks technology is a promising candidate for various potential applications in the domains of health, monitoring, sport, etc. The optimization of WBANs at the system level requires an accurate knowledge of the propagation channel which plays a key role on the design of the other layers. The explosive combinatory due to the numerous sources of variability and the diversity of the situations should be reduced to be reasonably analyzed. One way is to try to separate the “on-body” cluster from the “off-body” clusters due to MPCs coming from the surrounding environment. This allows to analyze separately the proper sources of variability (population, postures and movements, antennas, etc.) from the exogenous influence of the environment, reducing considerably the required experimental effort and simplifying the modeling process. It is proposed here to separate the “fine structure” of the Power Delay Profile in three contributions: the “on-body cluster”, a “transition region” dominated by “off-body MPCs” and the superposition of the diffuse scattering tail and possible residual long range coherent clusters. The RMS delay spread statistics is also analyzed, as well as its correlation to the PL.
{"title":"Analysis of the channel power delay profile of WBAN scenarios in various indoor environments","authors":"C. Roblin","doi":"10.1109/ICUWB.2011.6058905","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058905","url":null,"abstract":"The Wireless Body Area Networks technology is a promising candidate for various potential applications in the domains of health, monitoring, sport, etc. The optimization of WBANs at the system level requires an accurate knowledge of the propagation channel which plays a key role on the design of the other layers. The explosive combinatory due to the numerous sources of variability and the diversity of the situations should be reduced to be reasonably analyzed. One way is to try to separate the “on-body” cluster from the “off-body” clusters due to MPCs coming from the surrounding environment. This allows to analyze separately the proper sources of variability (population, postures and movements, antennas, etc.) from the exogenous influence of the environment, reducing considerably the required experimental effort and simplifying the modeling process. It is proposed here to separate the “fine structure” of the Power Delay Profile in three contributions: the “on-body cluster”, a “transition region” dominated by “off-body MPCs” and the superposition of the diffuse scattering tail and possible residual long range coherent clusters. The RMS delay spread statistics is also analyzed, as well as its correlation to the PL.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130975607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058923
Seunghyun Oh, D. Wentzloff
In this paper, we present a step recovery diode (SRD) based ultra-wideband (UWB) transmitter. No custom integrated circuits (ICs) are used, and all of the components are commercially available off-the-shelf products, targeting low-cost and fast turn-around. UWB pulses are generated using SRDs, and pulse position modulation (PPM) is implemented by a microcontroller. Detailed analysis and equations for the SRD-based impulse generation are provided and verified with experimental results. This UWB transmitter has a measured full width half maximum (FWHM) pulse width of 213ps, pulse amplitude of 1.6V, and peak power of 17dBm. The data rate is 2.5MHz, which is limited by the maximum clock frequency of the microcontroller. The supply voltage for the entire circuit is 3V, which is compatible with coin batteries. The power consumption of the SRD pulse generator is 57mW, and the total power consumption of the complete transmitter is 70mW.
{"title":"A step recovery diode based UWB transmitter for low-cost impulse generation","authors":"Seunghyun Oh, D. Wentzloff","doi":"10.1109/ICUWB.2011.6058923","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058923","url":null,"abstract":"In this paper, we present a step recovery diode (SRD) based ultra-wideband (UWB) transmitter. No custom integrated circuits (ICs) are used, and all of the components are commercially available off-the-shelf products, targeting low-cost and fast turn-around. UWB pulses are generated using SRDs, and pulse position modulation (PPM) is implemented by a microcontroller. Detailed analysis and equations for the SRD-based impulse generation are provided and verified with experimental results. This UWB transmitter has a measured full width half maximum (FWHM) pulse width of 213ps, pulse amplitude of 1.6V, and peak power of 17dBm. The data rate is 2.5MHz, which is limited by the maximum clock frequency of the microcontroller. The supply voltage for the entire circuit is 3V, which is compatible with coin batteries. The power consumption of the SRD pulse generator is 57mW, and the total power consumption of the complete transmitter is 70mW.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134646026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058881
Xiaoyang Wang, A. Young, K. Philips, H. de Groot
The performance of a duty-cycled coherent impulse radio UWB system is typically dominated by the accuracy of its timing references. In this paper, a timing analysis is presented for an IR-UWB system to specify the accuracy requirements for the internal clocks of the transceiver. A possible clock generation unit is proposed to realize the coherent reception and improve sensitivity and SNR performance. The analysis is performed for an IEEE802.15.4a compliant data packet, however, can be extended to other IR-UWB standards easily.
{"title":"Clock accuracy analysis for a coherent IR-UWB system","authors":"Xiaoyang Wang, A. Young, K. Philips, H. de Groot","doi":"10.1109/ICUWB.2011.6058881","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058881","url":null,"abstract":"The performance of a duty-cycled coherent impulse radio UWB system is typically dominated by the accuracy of its timing references. In this paper, a timing analysis is presented for an IR-UWB system to specify the accuracy requirements for the internal clocks of the transceiver. A possible clock generation unit is proposed to realize the coherent reception and improve sensitivity and SNR performance. The analysis is performed for an IEEE802.15.4a compliant data packet, however, can be extended to other IR-UWB standards easily.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125225446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058874
K. Maichalernnukul, T. Kaiser, Feng Zheng
In this paper, the performance of ultrawideband (UWB) cooperative relay systems in the presence of narrowband (NB) interference is evaluated for the first time. Specifically, we consider UWB cooperative amplify-and-forward and UWB cooperative detect-and-forward systems where a single-tone NB interferer exists, and present their bit-error-rate analysis. Simulation results based on such analysis demonstrate how the NB interference impacts on the system performance.
{"title":"Performance of ultrawideband cooperative relay systems in the presence of narrowband interference","authors":"K. Maichalernnukul, T. Kaiser, Feng Zheng","doi":"10.1109/ICUWB.2011.6058874","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058874","url":null,"abstract":"In this paper, the performance of ultrawideband (UWB) cooperative relay systems in the presence of narrowband (NB) interference is evaluated for the first time. Specifically, we consider UWB cooperative amplify-and-forward and UWB cooperative detect-and-forward systems where a single-tone NB interferer exists, and present their bit-error-rate analysis. Simulation results based on such analysis demonstrate how the NB interference impacts on the system performance.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"264 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121816538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058845
Z. Ahmadian, L. Lampe
In this paper we consider the widely linear (WL) design of single and multiuser pre-equalization filters (PEFs) for pre-rake ultra-wideband communication systems that transmit binary phase-shift keying (BPSK) modulated data over multipath multiple-input single-output communication channels. The transmitter applies PEFs before spreading and pre-rake filtering while the receiver structure is very simple with a slicer for detection that follows directly after despreading. for this setting, we propose a modified mean square error criterion for PEF design that takes the real-valued signal constellation into account, i.e., aWL design, derive the closed-form optimum solutions for single and multiuser PEFs, and demonstrate the performance gains that are obtained as a result of this WL design approach.
{"title":"Widely linear design of pre-equalization filters for multiuser pre-rake UWB systems","authors":"Z. Ahmadian, L. Lampe","doi":"10.1109/ICUWB.2011.6058845","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058845","url":null,"abstract":"In this paper we consider the widely linear (WL) design of single and multiuser pre-equalization filters (PEFs) for pre-rake ultra-wideband communication systems that transmit binary phase-shift keying (BPSK) modulated data over multipath multiple-input single-output communication channels. The transmitter applies PEFs before spreading and pre-rake filtering while the receiver structure is very simple with a slicer for detection that follows directly after despreading. for this setting, we propose a modified mean square error criterion for PEF design that takes the real-valued signal constellation into account, i.e., aWL design, derive the closed-form optimum solutions for single and multiuser PEFs, and demonstrate the performance gains that are obtained as a result of this WL design approach.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127487899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058814
D. Macagnano, G. Destino, G. D. de Abreu
Solving the distance-based network localization problem typically entails the formulation of an equivalent optimization problem which is either convex but sub-optimal, or optimal (i.e., maximum-likelihood) but non-convex. We show that the non-convexity implied by the choice of an optimal formulation need not be translated onto high computational complexity nor to performance degradation. To this end, we focus on an approach whereby low-complexity optimization algorithms are coupled with an efficient initialization which in turn, is formulated in terms of an Euclidean Distance Matrix (EDM) completion problem under the condition that the network is percolated (as required by Graph-based Completion). The resulting Hybrid Initialization scheme is shown to be sufficient to bring the performance of low-complexity algorithms such as the SMACOF and the NLS close to that of far more sophisticated alternatives such as the SDP.
{"title":"Hybrid initialization for non-convex network localization problems","authors":"D. Macagnano, G. Destino, G. D. de Abreu","doi":"10.1109/ICUWB.2011.6058814","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058814","url":null,"abstract":"Solving the distance-based network localization problem typically entails the formulation of an equivalent optimization problem which is either convex but sub-optimal, or optimal (i.e., maximum-likelihood) but non-convex. We show that the non-convexity implied by the choice of an optimal formulation need not be translated onto high computational complexity nor to performance degradation. To this end, we focus on an approach whereby low-complexity optimization algorithms are coupled with an efficient initialization which in turn, is formulated in terms of an Euclidean Distance Matrix (EDM) completion problem under the condition that the network is percolated (as required by Graph-based Completion). The resulting Hybrid Initialization scheme is shown to be sufficient to bring the performance of low-complexity algorithms such as the SMACOF and the NLS close to that of far more sophisticated alternatives such as the SDP.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127798347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058921
Fabio Versolatto, A. Tonello, M. Girotto, C. Tornelli
We consider the deployment of impulsive ultra wide band (I-UWB) modulation for power line communications (PLC) on medium voltage (MV) networks. We firstly describe several receiver structures, and practical channel detection algorithms based on a data-aided approach. The joint estimation of the channel response and the noise correlation is also considered. Then, we address the system performance on real MV channels. The channels have been measured in a real MV test network. Results are provided in terms of bit error rate, with a power spectral density constraint.
{"title":"Performance of practical receiver schemes for impulsive UWB modulation on a real MV power line network","authors":"Fabio Versolatto, A. Tonello, M. Girotto, C. Tornelli","doi":"10.1109/ICUWB.2011.6058921","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058921","url":null,"abstract":"We consider the deployment of impulsive ultra wide band (I-UWB) modulation for power line communications (PLC) on medium voltage (MV) networks. We firstly describe several receiver structures, and practical channel detection algorithms based on a data-aided approach. The joint estimation of the channel response and the noise correlation is also considered. Then, we address the system performance on real MV channels. The channels have been measured in a real MV test network. Results are provided in terms of bit error rate, with a power spectral density constraint.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115415166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058909
Ahmed Benfarah, B. Miscopein, J. Gorce
Jamming is a major threat against wireless communications. In this paper, we evaluate the effect of jamming on an UWB link employing a PPM non-coherent receiver. We optimize the jammer parameters that are the central frequency and the bandwidth based on the metric of the signal-to-jamming ratio. The optimization depends on different system parameters such as the channel model and the integration time of the receiver.
{"title":"Optimizing jammer model against PPM UWB non-coherent receiver","authors":"Ahmed Benfarah, B. Miscopein, J. Gorce","doi":"10.1109/ICUWB.2011.6058909","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058909","url":null,"abstract":"Jamming is a major threat against wireless communications. In this paper, we evaluate the effect of jamming on an UWB link employing a PPM non-coherent receiver. We optimize the jammer parameters that are the central frequency and the bandwidth based on the metric of the signal-to-jamming ratio. The optimization depends on different system parameters such as the channel model and the integration time of the receiver.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114482668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058902
Navin Agarwal, R. Bhattacharjee, R. Jana
The prediction of the reflection and transmission phenomenon is important for modeling the indoor ultra wideband (UWB) communication environment. This paper develops an approach to analyze the reflection and transmission of UWB signals considering successive reflections inside a finite thickness building wall modeled as a lossy dielectric slab. The UWB signal source is modeled as a point source and when such a source transmits in an indoor environment, the waves impinge on the walls at different angles at different distances. The main objective of this work is to provide an analytical approach for obtaining the arriving angles at the interface of the wall and determine the reflected and transmitted signals taking the effect of the wall into consideration. The properties of the received UWB signal are investigated for different thickness and electrical parameters of the wall.
{"title":"Modeling of reflection and transmission of signal through building wall for a point source UWB transmitter","authors":"Navin Agarwal, R. Bhattacharjee, R. Jana","doi":"10.1109/ICUWB.2011.6058902","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058902","url":null,"abstract":"The prediction of the reflection and transmission phenomenon is important for modeling the indoor ultra wideband (UWB) communication environment. This paper develops an approach to analyze the reflection and transmission of UWB signals considering successive reflections inside a finite thickness building wall modeled as a lossy dielectric slab. The UWB signal source is modeled as a point source and when such a source transmits in an indoor environment, the waves impinge on the walls at different angles at different distances. The main objective of this work is to provide an analytical approach for obtaining the arriving angles at the interface of the wall and determine the reflected and transmitted signals taking the effect of the wall into consideration. The properties of the received UWB signal are investigated for different thickness and electrical parameters of the wall.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115083838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058924
J. Osth, O. Owais, M. Karlsson, A. Serban, Shaofang Gong
The use of Schottky diodes as high-speed variable impedance loads in six-port modulators are proposed and analyzed in this paper. The impedance dependency of diode parameters and local oscillator power are investigated by theoretical analysis and simulations. A prototype for a direct carrier six-port modulator using Schottky diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 300 Msymbol/s is generated, i.e., at a data rate of 1.2 Gbit/s, validating the use of Schottky diodes as high-speed variable impedance loads in six-port modulators.
{"title":"Schottky diode as high-speed variable impedance load in six-port modulators","authors":"J. Osth, O. Owais, M. Karlsson, A. Serban, Shaofang Gong","doi":"10.1109/ICUWB.2011.6058924","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058924","url":null,"abstract":"The use of Schottky diodes as high-speed variable impedance loads in six-port modulators are proposed and analyzed in this paper. The impedance dependency of diode parameters and local oscillator power are investigated by theoretical analysis and simulations. A prototype for a direct carrier six-port modulator using Schottky diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 300 Msymbol/s is generated, i.e., at a data rate of 1.2 Gbit/s, validating the use of Schottky diodes as high-speed variable impedance loads in six-port modulators.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115184608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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